HT49CV3 datasheet(24/44 Pages) HOLTEK

24 / 44 page

HT49RV3/HT49CV3

Rev. 1.30

March 20, 2007

VFD Display Control Register

- VFDC

Bit No.

Label

Function

2~0

VGS2~

VGS0

Selects the VFD display mode

000= 4 grids, 16 segments

001= 5 grids, 16 segments

010= 6 grids, 16 segments

011= 7 grids, 15 segments

100= 8 grids, 14 segments

101= 9 grids, 13 segments

110= 10 grids, 12 segments

111= 11 grids, 11 segments

Unused bit, read as

²0²

VFDE

Controls the VFD display

(1=enable; 0=disable)

7~5

VDM2~

VDM0

Sets the VFD dimming quantity

000= set pulse width to 1/16.

001= set pulse width to 2/16.

010= set pulse width to 4/16.

011= set pulse width to 10/16.

100= set pulse width to 11/16.

101= set pulse width to 12/16.

110= set pulse width to 13/16.

111= set pulse width to 14/16.

VFDC (28H) Register

At power-on initial, the 11-grid, 11-segment & 1/16 pulse

width are set and the VFD display is disabled.

The VFD clock source may come from the RTC or the

system clock/4 (fSYS/4).

V D D

0 V

V E E

V D D

0 V

V E E

V D D

0 V

V E E

V D D

0 V

V E E

V D D

0 V

V E E

G r i d 0

G r i d 1

G r i d 0

S e g m e n t s

O N

G r i d 1

S e g m e n t s

O N

A l l

S e g m e n t s

O F F

VFD Driver Output

SEG15~

SEG12

SEG11~

SEG8

SEG7~

SEG4

SEG3~

SEG0

Grid0

41HU

41HL

40HU

40HL

Grid1

43HU

43HL

42HU

42HL

Grid2

45HU

45HL

44HU

44HL

Grid3

47HU

47HL

46HU

46HL

Grid4

49HU

49HL

48HU

48HL

Grid5

4BHU

4BHL

4AHU

4AHL

Grid6

4DHU

4DHL

4CHU

4CHL

Grid7

4FHU

4FHL

4EHU

4EHL

Grid8

51HU

51HL

50HU

50HL

Grid9

53HU

53HL

52HU

52HL

Grid10

55HU

55HL

54HU

54HL

b4 b3

Higher 4 bits

Lower 4 bits

VFD Display Memory

HT49CV3 Datasheet(PDF) 24 Page - Holtek Semiconductor Inc

HT49CV3 Datasheet(HTML) 24 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL